2 * Copyright (C) 2010-2016 Canonical Ltd.
4 * This program is free software: you can redistribute it and/or modify it under
5 * the terms of the GNU General Public License as published by the Free Software
6 * Foundation, either version 3 of the License, or (at your option) any later
7 * version. See http://www.gnu.org/copyleft/gpl.html the full text of the
20 #include "configuration.h"
21 #include "shared-data-manager.h"
34 static guint signals[LAST_SIGNAL] = { 0 };
38 /* PAM service to authenticate with */
40 gchar *autologin_pam_service;
42 /* Buffer for data read from greeter */
45 gboolean use_secure_memory;
47 /* Hints for the greeter */
50 /* Default session to use */
51 gchar *default_session;
53 /* Sequence number of current PAM session */
54 guint32 authentication_sequence_number;
56 /* Remote session name */
57 gchar *remote_session;
59 /* Currently selected user */
60 gchar *active_username;
62 /* PAM session being constructed by the greeter */
63 Session *authentication_session;
65 /* TRUE if a the greeter can handle a reset; else we will just kill it instead */
68 /* TRUE if a user has been authenticated and the session requested to start */
69 gboolean start_session;
71 /* TRUE if can log into guest accounts */
74 /* TRUE if logging into guest session */
75 gboolean guest_account_authenticated;
77 /* Communication channels to communicate with */
79 int from_greeter_output;
80 GIOChannel *to_greeter_channel;
81 GIOChannel *from_greeter_channel;
82 guint from_greeter_watch;
85 G_DEFINE_TYPE (Greeter, greeter, G_TYPE_OBJECT);
87 /* Messages from the greeter to the server */
90 GREETER_MESSAGE_CONNECT = 0,
91 GREETER_MESSAGE_AUTHENTICATE,
92 GREETER_MESSAGE_AUTHENTICATE_AS_GUEST,
93 GREETER_MESSAGE_CONTINUE_AUTHENTICATION,
94 GREETER_MESSAGE_START_SESSION,
95 GREETER_MESSAGE_CANCEL_AUTHENTICATION,
96 GREETER_MESSAGE_SET_LANGUAGE,
97 GREETER_MESSAGE_AUTHENTICATE_REMOTE,
98 GREETER_MESSAGE_ENSURE_SHARED_DIR,
101 /* Messages from the server to the greeter */
104 SERVER_MESSAGE_CONNECTED = 0,
105 SERVER_MESSAGE_PROMPT_AUTHENTICATION,
106 SERVER_MESSAGE_END_AUTHENTICATION,
107 SERVER_MESSAGE_SESSION_RESULT,
108 SERVER_MESSAGE_SHARED_DIR_RESULT,
110 SERVER_MESSAGE_RESET,
113 static gboolean read_cb (GIOChannel *source, GIOCondition condition, gpointer data);
118 return g_object_new (GREETER_TYPE, NULL);
122 greeter_start (Greeter *greeter, gboolean (*setup_child_cb)(Greeter *greeter, int input_fd, int output_fd, gpointer user_data), gpointer user_data)
124 int to_greeter_pipe[2], from_greeter_pipe[2];
125 int to_greeter_output, from_greeter_input;
127 GError *error = NULL;
129 /* Create a pipe to talk with the greeter */
130 if (pipe (to_greeter_pipe) != 0 || pipe (from_greeter_pipe) != 0)
132 g_warning ("Failed to create pipes: %s", strerror (errno));
135 to_greeter_output = to_greeter_pipe[0];
136 greeter->priv->to_greeter_input = to_greeter_pipe[1];
137 greeter->priv->to_greeter_channel = g_io_channel_unix_new (greeter->priv->to_greeter_input);
138 g_io_channel_set_encoding (greeter->priv->to_greeter_channel, NULL, &error);
140 g_warning ("Failed to set encoding on to greeter channel to binary: %s\n", error->message);
141 g_clear_error (&error);
142 greeter->priv->from_greeter_output = from_greeter_pipe[0];
143 from_greeter_input = from_greeter_pipe[1];
144 greeter->priv->from_greeter_channel = g_io_channel_unix_new (greeter->priv->from_greeter_output);
145 g_io_channel_set_encoding (greeter->priv->from_greeter_channel, NULL, &error);
147 g_warning ("Failed to set encoding on from greeter channel to binary: %s\n", error->message);
148 g_clear_error (&error);
149 g_io_channel_set_buffered (greeter->priv->from_greeter_channel, FALSE);
150 greeter->priv->from_greeter_watch = g_io_add_watch (greeter->priv->from_greeter_channel, G_IO_IN | G_IO_HUP, read_cb, greeter);
152 /* Don't allow the daemon end of the pipes to be accessed in child processes */
153 fcntl (greeter->priv->to_greeter_input, F_SETFD, FD_CLOEXEC);
154 fcntl (greeter->priv->from_greeter_output, F_SETFD, FD_CLOEXEC);
156 result = setup_child_cb (greeter, from_greeter_input, to_greeter_output, user_data);
158 /* Close the session ends of the pipe */
159 close (from_greeter_input);
160 close (to_greeter_output);
166 greeter_stop (Greeter *greeter)
168 /* Stop any events occurring after we've stopped */
169 if (greeter->priv->authentication_session)
170 g_signal_handlers_disconnect_matched (greeter->priv->authentication_session, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, greeter);
174 greeter_set_pam_services (Greeter *greeter, const gchar *pam_service, const gchar *autologin_pam_service)
176 g_return_if_fail (greeter != NULL);
177 g_free (greeter->priv->pam_service);
178 greeter->priv->pam_service = g_strdup (pam_service);
179 g_free (greeter->priv->autologin_pam_service);
180 greeter->priv->autologin_pam_service = g_strdup (autologin_pam_service);
184 greeter_set_allow_guest (Greeter *greeter, gboolean allow_guest)
186 g_return_if_fail (greeter != NULL);
187 greeter->priv->allow_guest = allow_guest;
191 greeter_clear_hints (Greeter *greeter)
193 g_return_if_fail (greeter != NULL);
194 g_hash_table_remove_all (greeter->priv->hints);
198 greeter_set_hint (Greeter *greeter, const gchar *name, const gchar *value)
200 g_return_if_fail (greeter != NULL);
201 g_hash_table_insert (greeter->priv->hints, g_strdup (name), g_strdup (value));
205 secure_malloc (Greeter *greeter, size_t n)
207 if (greeter->priv->use_secure_memory)
208 return gcry_malloc_secure (n);
214 secure_realloc (Greeter *greeter, void *ptr, size_t n)
216 if (greeter->priv->use_secure_memory)
217 return gcry_realloc (ptr, n);
219 return g_realloc (ptr, n);
223 secure_free (Greeter *greeter, void *ptr)
225 if (greeter->priv->use_secure_memory)
226 return gcry_free (ptr);
237 #define HEADER_SIZE (sizeof (guint32) * 2)
238 #define MAX_MESSAGE_LENGTH 1024
241 write_message (Greeter *greeter, guint8 *message, gsize message_length)
245 GError *error = NULL;
247 data = (gchar *) message;
248 data_length = message_length;
249 while (data_length > 0)
254 status = g_io_channel_write_chars (greeter->priv->to_greeter_channel, data, data_length, &n_written, &error);
256 g_warning ("Error writing to greeter: %s", error->message);
257 g_clear_error (&error);
258 if (status != G_IO_STATUS_NORMAL)
260 data_length -= n_written;
264 g_io_channel_flush (greeter->priv->to_greeter_channel, &error);
266 g_warning ("Failed to flush data to greeter: %s", error->message);
267 g_clear_error (&error);
271 write_int (guint8 *buffer, gint buffer_length, guint32 value, gsize *offset)
273 if (*offset + 4 >= buffer_length)
275 buffer[*offset] = value >> 24;
276 buffer[*offset+1] = (value >> 16) & 0xFF;
277 buffer[*offset+2] = (value >> 8) & 0xFF;
278 buffer[*offset+3] = value & 0xFF;
283 write_string (guint8 *buffer, gint buffer_length, const gchar *value, gsize *offset)
288 length = strlen (value);
291 write_int (buffer, buffer_length, length, offset);
292 if (*offset + length >= buffer_length)
296 memcpy (buffer + *offset, value, length);
302 write_header (guint8 *buffer, gint buffer_length, guint32 id, guint32 length, gsize *offset)
304 write_int (buffer, buffer_length, id, offset);
305 write_int (buffer, buffer_length, length, offset);
309 string_length (const gchar *value)
312 return int_length ();
314 return int_length () + strlen (value);
318 handle_connect (Greeter *greeter, const gchar *version, gboolean resettable)
320 guint8 message[MAX_MESSAGE_LENGTH];
326 g_debug ("Greeter connected version=%s resettable=%s", version, resettable ? "true" : "false");
328 greeter->priv->resettable = resettable;
330 length = string_length (VERSION);
331 g_hash_table_iter_init (&iter, greeter->priv->hints);
332 while (g_hash_table_iter_next (&iter, &key, &value))
333 length += string_length (key) + string_length (value);
335 write_header (message, MAX_MESSAGE_LENGTH, SERVER_MESSAGE_CONNECTED, length, &offset);
336 write_string (message, MAX_MESSAGE_LENGTH, VERSION, &offset);
337 g_hash_table_iter_init (&iter, greeter->priv->hints);
338 while (g_hash_table_iter_next (&iter, &key, &value))
340 write_string (message, MAX_MESSAGE_LENGTH, key, &offset);
341 write_string (message, MAX_MESSAGE_LENGTH, value, &offset);
343 write_message (greeter, message, offset);
345 g_signal_emit (greeter, signals[CONNECTED], 0);
349 pam_messages_cb (Session *session, Greeter *greeter)
353 guint8 message[MAX_MESSAGE_LENGTH];
354 const struct pam_message *messages;
359 messages = session_get_messages (session);
360 messages_length = session_get_messages_length (session);
362 /* Respond to d-bus query with messages */
363 g_debug ("Prompt greeter with %d message(s)", messages_length);
364 size = int_length () + string_length (session_get_username (session)) + int_length ();
365 for (i = 0; i < messages_length; i++)
366 size += int_length () + string_length (messages[i].msg);
368 write_header (message, MAX_MESSAGE_LENGTH, SERVER_MESSAGE_PROMPT_AUTHENTICATION, size, &offset);
369 write_int (message, MAX_MESSAGE_LENGTH, greeter->priv->authentication_sequence_number, &offset);
370 write_string (message, MAX_MESSAGE_LENGTH, session_get_username (session), &offset);
371 write_int (message, MAX_MESSAGE_LENGTH, messages_length, &offset);
372 for (i = 0; i < messages_length; i++)
374 write_int (message, MAX_MESSAGE_LENGTH, messages[i].msg_style, &offset);
375 write_string (message, MAX_MESSAGE_LENGTH, messages[i].msg, &offset);
377 if (messages[i].msg_style == PAM_PROMPT_ECHO_OFF || messages[i].msg_style == PAM_PROMPT_ECHO_ON)
380 write_message (greeter, message, offset);
382 /* Continue immediately if nothing to respond with */
383 // FIXME: Should probably give the greeter a chance to ack the message
386 struct pam_response *response;
387 response = calloc (messages_length, sizeof (struct pam_response));
388 session_respond (greeter->priv->authentication_session, response);
394 send_end_authentication (Greeter *greeter, guint32 sequence_number, const gchar *username, int result)
396 guint8 message[MAX_MESSAGE_LENGTH];
399 write_header (message, MAX_MESSAGE_LENGTH, SERVER_MESSAGE_END_AUTHENTICATION, int_length () + string_length (username) + int_length (), &offset);
400 write_int (message, MAX_MESSAGE_LENGTH, sequence_number, &offset);
401 write_string (message, MAX_MESSAGE_LENGTH, username, &offset);
402 write_int (message, MAX_MESSAGE_LENGTH, result, &offset);
403 write_message (greeter, message, offset);
407 greeter_idle (Greeter *greeter)
409 guint8 message[MAX_MESSAGE_LENGTH];
412 write_header (message, MAX_MESSAGE_LENGTH, SERVER_MESSAGE_IDLE, 0, &offset);
413 write_message (greeter, message, offset);
417 greeter_reset (Greeter *greeter)
419 guint8 message[MAX_MESSAGE_LENGTH];
425 g_return_if_fail (greeter != NULL);
427 g_hash_table_iter_init (&iter, greeter->priv->hints);
428 while (g_hash_table_iter_next (&iter, &key, &value))
429 length += string_length (key) + string_length (value);
431 write_header (message, MAX_MESSAGE_LENGTH, SERVER_MESSAGE_RESET, length, &offset);
432 g_hash_table_iter_init (&iter, greeter->priv->hints);
433 while (g_hash_table_iter_next (&iter, &key, &value))
435 write_string (message, MAX_MESSAGE_LENGTH, key, &offset);
436 write_string (message, MAX_MESSAGE_LENGTH, value, &offset);
438 write_message (greeter, message, offset);
442 authentication_complete_cb (Session *session, Greeter *greeter)
446 g_debug ("Authenticate result for user %s: %s", session_get_username (session), session_get_authentication_result_string (session));
448 result = session_get_authentication_result (session);
449 if (session_get_is_authenticated (session))
451 if (session_get_user (session))
452 g_debug ("User %s authorized", session_get_username (session));
455 g_debug ("User %s authorized, but no account of that name exists", session_get_username (session));
456 result = PAM_USER_UNKNOWN;
460 send_end_authentication (greeter, greeter->priv->authentication_sequence_number, session_get_username (session), result);
464 reset_session (Greeter *greeter)
466 g_free (greeter->priv->remote_session);
467 greeter->priv->remote_session = NULL;
468 if (greeter->priv->authentication_session)
470 g_signal_handlers_disconnect_matched (greeter->priv->authentication_session, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, greeter);
471 session_stop (greeter->priv->authentication_session);
472 g_clear_object (&greeter->priv->authentication_session);
475 greeter->priv->guest_account_authenticated = FALSE;
479 handle_login (Greeter *greeter, guint32 sequence_number, const gchar *username)
481 const gchar *autologin_username, *service;
482 gboolean is_interactive;
484 if (username[0] == '\0')
486 g_debug ("Greeter start authentication");
490 g_debug ("Greeter start authentication for %s", username);
492 reset_session (greeter);
494 if (greeter->priv->active_username)
495 g_free (greeter->priv->active_username);
496 greeter->priv->active_username = g_strdup (username);
497 g_object_notify (G_OBJECT (greeter), GREETER_PROPERTY_ACTIVE_USERNAME);
499 greeter->priv->authentication_sequence_number = sequence_number;
500 g_signal_emit (greeter, signals[CREATE_SESSION], 0, &greeter->priv->authentication_session);
501 if (!greeter->priv->authentication_session)
503 send_end_authentication (greeter, sequence_number, "", PAM_USER_UNKNOWN);
507 g_signal_connect (G_OBJECT (greeter->priv->authentication_session), SESSION_SIGNAL_GOT_MESSAGES, G_CALLBACK (pam_messages_cb), greeter);
508 g_signal_connect (G_OBJECT (greeter->priv->authentication_session), SESSION_SIGNAL_AUTHENTICATION_COMPLETE, G_CALLBACK (authentication_complete_cb), greeter);
510 /* Use non-interactive service for autologin user */
511 autologin_username = g_hash_table_lookup (greeter->priv->hints, "autologin-user");
512 if (autologin_username != NULL && g_strcmp0 (username, autologin_username) == 0)
514 service = greeter->priv->autologin_pam_service;
515 is_interactive = FALSE;
519 service = greeter->priv->pam_service;
520 is_interactive = TRUE;
523 /* Run the session process */
524 session_set_pam_service (greeter->priv->authentication_session, service);
525 session_set_username (greeter->priv->authentication_session, username);
526 session_set_do_authenticate (greeter->priv->authentication_session, TRUE);
527 session_set_is_interactive (greeter->priv->authentication_session, is_interactive);
528 session_start (greeter->priv->authentication_session);
532 handle_login_as_guest (Greeter *greeter, guint32 sequence_number)
534 g_debug ("Greeter start authentication for guest account");
536 reset_session (greeter);
538 if (!greeter->priv->allow_guest)
540 g_debug ("Guest account is disabled");
541 send_end_authentication (greeter, sequence_number, "", PAM_USER_UNKNOWN);
545 greeter->priv->guest_account_authenticated = TRUE;
546 send_end_authentication (greeter, sequence_number, "", PAM_SUCCESS);
550 get_remote_session_service (const gchar *session_name)
552 GKeyFile *session_desktop_file;
555 gchar *remote_sessions_dir, *filename, *path, *service = NULL;
556 GError *error = NULL;
558 /* Validate session name doesn't contain directory separators */
559 for (c = session_name; *c; c++)
565 /* Load the session file */
566 session_desktop_file = g_key_file_new ();
567 filename = g_strdup_printf ("%s.desktop", session_name);
568 remote_sessions_dir = config_get_string (config_get_instance (), "LightDM", "remote-sessions-directory");
569 path = g_build_filename (remote_sessions_dir, filename, NULL);
570 g_free (remote_sessions_dir);
572 result = g_key_file_load_from_file (session_desktop_file, path, G_KEY_FILE_NONE, &error);
574 g_debug ("Failed to load session file %s: %s", path, error->message);
576 g_clear_error (&error);
578 service = g_key_file_get_string (session_desktop_file, G_KEY_FILE_DESKTOP_GROUP, "X-LightDM-PAM-Service", NULL);
579 g_key_file_free (session_desktop_file);
585 handle_login_remote (Greeter *greeter, const gchar *session_name, const gchar *username, guint32 sequence_number)
589 if (username[0] == '\0')
591 g_debug ("Greeter start authentication for remote session %s", session_name);
595 g_debug ("Greeter start authentication for remote session %s as user %s", session_name, username);
597 reset_session (greeter);
599 service = get_remote_session_service (session_name);
602 send_end_authentication (greeter, sequence_number, "", PAM_SYSTEM_ERR);
606 greeter->priv->authentication_sequence_number = sequence_number;
607 greeter->priv->remote_session = g_strdup (session_name);
608 g_signal_emit (greeter, signals[CREATE_SESSION], 0, &greeter->priv->authentication_session);
609 if (greeter->priv->authentication_session)
611 g_signal_connect (G_OBJECT (greeter->priv->authentication_session), SESSION_SIGNAL_GOT_MESSAGES, G_CALLBACK (pam_messages_cb), greeter);
612 g_signal_connect (G_OBJECT (greeter->priv->authentication_session), SESSION_SIGNAL_AUTHENTICATION_COMPLETE, G_CALLBACK (authentication_complete_cb), greeter);
614 /* Run the session process */
615 session_set_pam_service (greeter->priv->authentication_session, service);
616 session_set_username (greeter->priv->authentication_session, username);
617 session_set_do_authenticate (greeter->priv->authentication_session, TRUE);
618 session_set_is_interactive (greeter->priv->authentication_session, TRUE);
619 session_set_is_guest (greeter->priv->authentication_session, TRUE);
620 session_start (greeter->priv->authentication_session);
625 if (!greeter->priv->authentication_session)
627 send_end_authentication (greeter, sequence_number, "", PAM_USER_UNKNOWN);
633 handle_continue_authentication (Greeter *greeter, gchar **secrets)
636 const struct pam_message *messages;
637 struct pam_response *response;
638 int i, j, n_prompts = 0;
640 /* Not in authentication */
641 if (greeter->priv->authentication_session == NULL)
644 messages_length = session_get_messages_length (greeter->priv->authentication_session);
645 messages = session_get_messages (greeter->priv->authentication_session);
647 /* Check correct number of responses */
648 for (i = 0; i < messages_length; i++)
650 int msg_style = messages[i].msg_style;
651 if (msg_style == PAM_PROMPT_ECHO_OFF || msg_style == PAM_PROMPT_ECHO_ON)
654 if (g_strv_length (secrets) != n_prompts)
656 session_respond_error (greeter->priv->authentication_session, PAM_CONV_ERR);
660 g_debug ("Continue authentication");
663 response = calloc (messages_length, sizeof (struct pam_response));
664 for (i = 0, j = 0; i < messages_length; i++)
666 int msg_style = messages[i].msg_style;
667 if (msg_style == PAM_PROMPT_ECHO_OFF || msg_style == PAM_PROMPT_ECHO_ON)
669 size_t secret_length = strlen (secrets[j]) + 1;
670 response[i].resp = secure_malloc (greeter, secret_length);
671 memcpy (response[i].resp, secrets[j], secret_length); // FIXME: Need to convert from UTF-8
676 session_respond (greeter->priv->authentication_session, response);
678 for (i = 0; i < messages_length; i++)
679 secure_free (greeter, response[i].resp);
684 handle_cancel_authentication (Greeter *greeter)
686 /* Not in authentication */
687 if (greeter->priv->authentication_session == NULL)
690 g_debug ("Cancel authentication");
691 reset_session (greeter);
695 handle_start_session (Greeter *greeter, const gchar *session)
698 guint8 message[MAX_MESSAGE_LENGTH];
700 SessionType session_type = SESSION_TYPE_LOCAL;
702 if (strcmp (session, "") == 0)
705 /* Use session type chosen in remote session */
706 if (greeter->priv->remote_session)
708 session_type = SESSION_TYPE_REMOTE;
709 session = greeter->priv->remote_session;
712 if (greeter->priv->guest_account_authenticated || session_get_is_authenticated (greeter->priv->authentication_session))
715 g_debug ("Greeter requests session %s", session);
717 g_debug ("Greeter requests default session");
718 greeter->priv->start_session = TRUE;
719 g_signal_emit (greeter, signals[START_SESSION], 0, session_type, session, &result);
723 g_debug ("Ignoring start session request, user is not authorized");
727 write_header (message, MAX_MESSAGE_LENGTH, SERVER_MESSAGE_SESSION_RESULT, int_length (), &offset);
728 write_int (message, MAX_MESSAGE_LENGTH, result ? 0 : 1, &offset);
729 write_message (greeter, message, offset);
733 handle_set_language (Greeter *greeter, const gchar *language)
737 if (!greeter->priv->guest_account_authenticated && !session_get_is_authenticated (greeter->priv->authentication_session))
739 g_debug ("Ignoring set language request, user is not authorized");
743 // FIXME: Could use this
744 if (greeter->priv->guest_account_authenticated)
746 g_debug ("Ignoring set language request for guest user");
750 g_debug ("Greeter sets language %s", language);
751 user = session_get_user (greeter->priv->authentication_session);
752 user_set_language (user, language);
756 handle_ensure_shared_dir (Greeter *greeter, const gchar *username)
759 guint8 message[MAX_MESSAGE_LENGTH];
762 g_debug ("Greeter requests data directory for user %s", username);
764 dir = shared_data_manager_ensure_user_dir (shared_data_manager_get_instance (), username);
766 write_header (message, MAX_MESSAGE_LENGTH, SERVER_MESSAGE_SHARED_DIR_RESULT, string_length (dir), &offset);
767 write_string (message, MAX_MESSAGE_LENGTH, dir, &offset);
768 write_message (greeter, message, offset);
774 read_int (Greeter *greeter, gsize *offset)
778 if (greeter->priv->n_read - *offset < sizeof (guint32))
780 g_warning ("Not enough space for int, need %zu, got %zu", sizeof (guint32), greeter->priv->n_read - *offset);
783 buffer = greeter->priv->read_buffer + *offset;
784 value = buffer[0] << 24 | buffer[1] << 16 | buffer[2] << 8 | buffer[3];
785 *offset += int_length ();
790 get_message_length (Greeter *greeter)
795 offset = int_length ();
796 payload_length = read_int (greeter, &offset);
798 if (HEADER_SIZE + payload_length < HEADER_SIZE)
800 g_warning ("Payload length of %u octets too long", payload_length);
804 return HEADER_SIZE + payload_length;
808 read_string_full (Greeter *greeter, gsize *offset, void* (*alloc_fn)(size_t n))
813 length = read_int (greeter, offset);
814 if (greeter->priv->n_read - *offset < length)
816 g_warning ("Not enough space for string, need %u, got %zu", length, greeter->priv->n_read - *offset);
817 return g_strdup ("");
820 value = (*alloc_fn) (sizeof (gchar) * (length + 1));
821 memcpy (value, greeter->priv->read_buffer + *offset, length);
822 value[length] = '\0';
829 read_string (Greeter *greeter, gsize *offset)
831 return read_string_full (greeter, offset, g_malloc);
835 read_secret (Greeter *greeter, gsize *offset)
837 if (greeter->priv->use_secure_memory)
838 return read_string_full (greeter, offset, gcry_malloc_secure);
840 return read_string_full (greeter, offset, g_malloc);
844 read_cb (GIOChannel *source, GIOCondition condition, gpointer data)
846 Greeter *greeter = data;
847 gsize n_to_read, n_read, offset;
850 guint32 sequence_number, n_secrets, max_secrets;
851 gchar *version, *username, *session_name, *language;
853 gboolean resettable = FALSE;
854 GError *error = NULL;
856 if (condition == G_IO_HUP)
858 g_debug ("Greeter closed communication channel");
859 greeter->priv->from_greeter_watch = 0;
863 n_to_read = HEADER_SIZE;
864 if (greeter->priv->n_read >= HEADER_SIZE)
866 n_to_read = get_message_length (greeter);
867 if (n_to_read <= HEADER_SIZE)
869 greeter->priv->from_greeter_watch = 0;
874 status = g_io_channel_read_chars (greeter->priv->from_greeter_channel,
875 (gchar *) greeter->priv->read_buffer + greeter->priv->n_read,
876 n_to_read - greeter->priv->n_read,
880 g_warning ("Error reading from greeter: %s", error->message);
881 g_clear_error (&error);
882 if (status != G_IO_STATUS_NORMAL)
885 greeter->priv->n_read += n_read;
886 if (greeter->priv->n_read != n_to_read)
889 /* If have header, rerun for content */
890 if (greeter->priv->n_read == HEADER_SIZE)
892 n_to_read = get_message_length (greeter);
893 if (n_to_read > HEADER_SIZE)
895 greeter->priv->read_buffer = secure_realloc (greeter, greeter->priv->read_buffer, n_to_read);
896 read_cb (source, condition, greeter);
902 id = read_int (greeter, &offset);
903 length = HEADER_SIZE + read_int (greeter, &offset);
906 case GREETER_MESSAGE_CONNECT:
907 version = read_string (greeter, &offset);
909 resettable = read_int (greeter, &offset) != 0;
910 handle_connect (greeter, version, resettable);
913 case GREETER_MESSAGE_AUTHENTICATE:
914 sequence_number = read_int (greeter, &offset);
915 username = read_string (greeter, &offset);
916 handle_login (greeter, sequence_number, username);
919 case GREETER_MESSAGE_AUTHENTICATE_AS_GUEST:
920 sequence_number = read_int (greeter, &offset);
921 handle_login_as_guest (greeter, sequence_number);
923 case GREETER_MESSAGE_AUTHENTICATE_REMOTE:
924 sequence_number = read_int (greeter, &offset);
925 session_name = read_string (greeter, &offset);
926 username = read_string (greeter, &offset);
927 handle_login_remote (greeter, session_name, username, sequence_number);
929 case GREETER_MESSAGE_CONTINUE_AUTHENTICATION:
930 n_secrets = read_int (greeter, &offset);
931 max_secrets = (G_MAXUINT32 - 1) / sizeof (gchar *);
932 if (n_secrets > max_secrets)
934 g_warning ("Array length of %u elements too long", n_secrets);
935 greeter->priv->from_greeter_watch = 0;
938 secrets = g_malloc (sizeof (gchar *) * (n_secrets + 1));
939 for (i = 0; i < n_secrets; i++)
940 secrets[i] = read_secret (greeter, &offset);
942 handle_continue_authentication (greeter, secrets);
943 for (i = 0; i < n_secrets; i++)
944 secure_free (greeter, secrets[i]);
947 case GREETER_MESSAGE_CANCEL_AUTHENTICATION:
948 handle_cancel_authentication (greeter);
950 case GREETER_MESSAGE_START_SESSION:
951 session_name = read_string (greeter, &offset);
952 handle_start_session (greeter, session_name);
953 g_free (session_name);
955 case GREETER_MESSAGE_SET_LANGUAGE:
956 language = read_string (greeter, &offset);
957 handle_set_language (greeter, language);
960 case GREETER_MESSAGE_ENSURE_SHARED_DIR:
961 username = read_string (greeter, &offset);
962 handle_ensure_shared_dir (greeter, username);
966 g_warning ("Unknown message from greeter: %d", id);
970 greeter->priv->n_read = 0;
976 greeter_get_guest_authenticated (Greeter *greeter)
978 g_return_val_if_fail (greeter != NULL, FALSE);
979 return greeter->priv->guest_account_authenticated;
983 greeter_get_authentication_session (Greeter *greeter)
985 g_return_val_if_fail (greeter != NULL, NULL);
986 return greeter->priv->authentication_session;
990 greeter_get_resettable (Greeter *greeter)
992 g_return_val_if_fail (greeter != NULL, FALSE);
993 return greeter->priv->resettable;
997 greeter_get_start_session (Greeter *greeter)
999 g_return_val_if_fail (greeter != NULL, FALSE);
1000 return greeter->priv->start_session;
1004 greeter_get_active_username (Greeter *greeter)
1006 g_return_val_if_fail (greeter != NULL, NULL);
1007 return greeter->priv->active_username;
1011 greeter_real_create_session (Greeter *greeter)
1017 greeter_real_start_session (Greeter *greeter, SessionType type, const gchar *session)
1023 greeter_init (Greeter *greeter)
1025 greeter->priv = G_TYPE_INSTANCE_GET_PRIVATE (greeter, GREETER_TYPE, GreeterPrivate);
1026 greeter->priv->read_buffer = secure_malloc (greeter, HEADER_SIZE);
1027 greeter->priv->hints = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_free);
1028 greeter->priv->use_secure_memory = config_get_boolean (config_get_instance (), "LightDM", "lock-memory");
1029 greeter->priv->to_greeter_input = -1;
1030 greeter->priv->from_greeter_output = -1;
1034 greeter_finalize (GObject *object)
1036 Greeter *self = GREETER (object);
1038 g_free (self->priv->pam_service);
1039 g_free (self->priv->autologin_pam_service);
1040 secure_free (self, self->priv->read_buffer);
1041 g_hash_table_unref (self->priv->hints);
1042 g_free (self->priv->remote_session);
1043 g_free (self->priv->active_username);
1044 if (self->priv->authentication_session)
1046 g_signal_handlers_disconnect_matched (self->priv->authentication_session, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, self);
1047 g_object_unref (self->priv->authentication_session);
1049 close (self->priv->to_greeter_input);
1050 close (self->priv->from_greeter_output);
1051 if (self->priv->to_greeter_channel)
1052 g_io_channel_unref (self->priv->to_greeter_channel);
1053 if (self->priv->from_greeter_channel)
1054 g_io_channel_unref (self->priv->from_greeter_channel);
1055 if (self->priv->from_greeter_watch)
1056 g_source_remove (self->priv->from_greeter_watch);
1058 G_OBJECT_CLASS (greeter_parent_class)->finalize (object);
1062 greeter_set_property (GObject *object,
1064 const GValue *value,
1067 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1071 greeter_get_property (GObject *object,
1076 Greeter *greeter = GREETER (object);
1079 case PROP_ACTIVE_USERNAME:
1080 g_value_set_string (value, greeter_get_active_username (greeter));
1083 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1089 greeter_class_init (GreeterClass *klass)
1091 GObjectClass *object_class = G_OBJECT_CLASS (klass);
1093 klass->create_session = greeter_real_create_session;
1094 klass->start_session = greeter_real_start_session;
1095 object_class->finalize = greeter_finalize;
1096 object_class->get_property = greeter_get_property;
1097 object_class->set_property = greeter_set_property;
1099 signals[CONNECTED] =
1100 g_signal_new (GREETER_SIGNAL_CONNECTED,
1101 G_TYPE_FROM_CLASS (klass),
1103 G_STRUCT_OFFSET (GreeterClass, connected),
1108 signals[CREATE_SESSION] =
1109 g_signal_new (GREETER_SIGNAL_CREATE_SESSION,
1110 G_TYPE_FROM_CLASS (klass),
1112 G_STRUCT_OFFSET (GreeterClass, create_session),
1113 g_signal_accumulator_first_wins,
1118 signals[START_SESSION] =
1119 g_signal_new (GREETER_SIGNAL_START_SESSION,
1120 G_TYPE_FROM_CLASS (klass),
1122 G_STRUCT_OFFSET (GreeterClass, start_session),
1123 g_signal_accumulator_true_handled,
1126 G_TYPE_BOOLEAN, 2, G_TYPE_INT, G_TYPE_STRING);
1128 g_object_class_install_property (object_class,
1129 PROP_ACTIVE_USERNAME,
1130 g_param_spec_string (GREETER_PROPERTY_ACTIVE_USERNAME,
1131 GREETER_PROPERTY_ACTIVE_USERNAME,
1136 g_type_class_add_private (klass, sizeof (GreeterPrivate));